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GOODWILL AND OTHER INTANGIBLE ASSETS, Intangible Assets Subject to Amortization (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	0 Months Ended
	Mar. 31, 2015	May 29, 2014	Sep. 22, 2014	Aug. 01, 2014
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	$ 31,144us-gaap_FiniteLivedIntangibleAssetsNet
Effect of change in foreign currency exchange rates	(440)
Amortization	(637)us-gaap_AmortizationOfIntangibleAssets
Acquisition of business/development	0
Balance as of March 31, 2015	30,067us-gaap_FiniteLivedIntangibleAssetsNet
Corporate [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	22
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	22
Pansend, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	114
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	114
Schuff International, Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	4,304
Effect of change in foreign currency exchange rates	0
Amortization	(75)
Acquisition of business/development	0	4,478
Balance as of March 31, 2015	4,229
Global Marine Systems Limited [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	9,786
Effect of change in foreign currency exchange rates	(440)
Amortization	(298)
Acquisition of business/development	0		10,557
Balance as of March 31, 2015	9,048
American Natural Gas [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	10,918
Effect of change in foreign currency exchange rates	0
Amortization	(264)
Acquisition of business/development	0			9,000
Balance as of March 31, 2015	10,654
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	6,000
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	6,000
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	11,338
Effect of change in foreign currency exchange rates	(49)
Amortization	(319)
Acquisition of business/development	0
Balance as of March 31, 2015	10,970
Trade Names [Member] \| Corporate [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Trade Names [Member] \| Pansend, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Trade Names [Member] \| Schuff International, Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	4,304
Effect of change in foreign currency exchange rates	0
Amortization	(75)
Acquisition of business/development	0	4,478
Balance as of March 31, 2015	4,229
Trade Names [Member] \| Global Marine Systems Limited [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	997
Effect of change in foreign currency exchange rates	(49)
Amortization	(86)
Acquisition of business/development	0		1,137
Balance as of March 31, 2015	862
Trade Names [Member] \| American Natural Gas [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	6,037
Effect of change in foreign currency exchange rates	0
Amortization	(158)
Acquisition of business/development	0			6,300
Balance as of March 31, 2015	5,879
Trade Names [Member] \| Other [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	12,214
Effect of change in foreign currency exchange rates	(321)
Amortization	(225)
Acquisition of business/development	0
Balance as of March 31, 2015	11,668
Customer Relationships [Member] \| Corporate [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Customer Relationships [Member] \| Pansend, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Customer Relationships [Member] \| Schuff International, Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Customer Relationships [Member] \| Global Marine Systems Limited [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	7,333
Effect of change in foreign currency exchange rates	(321)
Amortization	(119)
Acquisition of business/development	0
Balance as of March 31, 2015	6,893
Customer Relationships [Member] \| American Natural Gas [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	4,881
Effect of change in foreign currency exchange rates	0
Amortization	(106)
Acquisition of business/development	0
Balance as of March 31, 2015	4,775
Customer Relationships [Member] \| Other [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	1,456
Effect of change in foreign currency exchange rates	(70)
Amortization	(93)
Acquisition of business/development	0
Balance as of March 31, 2015	1,293
Developed Technology [Member] \| Corporate [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Developed Technology [Member] \| Pansend, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Developed Technology [Member] \| Schuff International, Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Developed Technology [Member] \| Global Marine Systems Limited [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	1,456
Effect of change in foreign currency exchange rates	(70)
Amortization	(93)
Acquisition of business/development	0		1,624
Balance as of March 31, 2015	1,293
Developed Technology [Member] \| American Natural Gas [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Developed Technology [Member] \| Other [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Effect of change in foreign currency exchange rates	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	6,136
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	6,136
Other [Member] \| Corporate [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	22
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	22
Other [Member] \| Pansend, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	114
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	114
Other [Member] \| Schuff International, Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Other [Member] \| Global Marine Systems Limited [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Other [Member] \| American Natural Gas [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	0
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	0
Other [Member] \| Other [Member]
Finite-Lived Intangible Assets [Line Items]
Balance as of December 31, 2014	6,000
Amortization	0
Acquisition of business/development	0
Balance as of March 31, 2015	$ 6,000